how long does it last

Lacey • Married since 2016❤️•Mommy of 7 👧🏻👧🏼👧🏻👧🏻👧🏼👶🏻👶🏻•
My almost 8 week old got diagnosed with thrush last Thursday and has been on needs since. 4 times a day and she STILL has it. The medicine bottle says give two days after the white patches are gone and that's it. How long does this last? The dr didn't tell me anything and he's gone till Monday.